Oh yeah -- being a parent has definitely been the most humbling experience of my life.
Also parenting really makes it sink in that you are in fact NOT in control over every aspect of your or your kids' lives; this is a critical lesson for the many control freaks among us scientists...

It's not the same. With the rejections, you can always resort to thinking, 1) those reviewers are morons, 2) I should have wrote this section differently, 3) if I only had time to put in more data. With kids, you can only throw your hands in the air, sigh, and learn to live with acceptance.

Oh, good, you mean the lessons I learned from stone cold hauling my toddler through the parking lot after he refused to hold my hand are going to be applicable when I have grad students? I look forward to it, though maybe with a little confusion.

I'm so awesome at parenting it just makes me more discouraged about how much I suck at science.
And by that, I mean I'm able to be completely deluded about parenting, but not so much about science. I also potato sack carried my child today. My theory: children do not adapt to rapidly warming weather well (or at least, my kid doesn't. His grandpa doesn't, so we've got someone to blame it on).

But yeah. If you haven't sucked hard at more things you've done, you haven't done enough interesting things.